CN1995979A - Laser breakdown spectrographic detection method and system for metal pollutants in water body - Google Patents
Laser breakdown spectrographic detection method and system for metal pollutants in water body Download PDFInfo
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- CN1995979A CN1995979A CN 200610098153 CN200610098153A CN1995979A CN 1995979 A CN1995979 A CN 1995979A CN 200610098153 CN200610098153 CN 200610098153 CN 200610098153 A CN200610098153 A CN 200610098153A CN 1995979 A CN1995979 A CN 1995979A
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Abstract
The water body metal pollution laser optical spectral penetration uses short pulse laser accumulation to generate high temperature ion on the water surface, excited atom, icon and molecule emitting lines of generated element component feature, through plasma spectrochemistry of the water sample to make strength analysis of the particular element line to decide the element content. The laser coupled to the emitting optical fiber through coupling lens, which receives the laser plasma signal, which is transmitted to optical spectrometer for light splitting, making photoelectric signal conversion by the CCD detector, coming into data collection and settlement system for treatment. It can be used for timely monitoring of poisonous metals.
Description
Technical field
The invention belongs to environment water pollution monitoring technology, specifically is water body metal pollutant laser spectrum detection method and system.
Background technology
Heavy metal in the water body and toxic metals pollutant are the typical pollutants that a class is easy to accumulate in sediment, enrichment in vivo, and influence ecological environment also affects human health by food chain.Metal pollutant in China's environment water is still based on spot sampling, lab analysis at present, and one time the analytical element project is limited, can not be in real time, the content that analyzes metallic element and metal pollutant in the polluted-water of original position, more can not realize the automatic continuous monitoring of polluted-water; In the environment of inclement condition, owing to can't carry out spot sampling, just difficult more to the real-time monitoring of metal element content, even can't realize.
In the monitoring of (comprising cadmium, chromium, lead, mercury, silver, gold, copper, zinc, iron etc.) of water body metal pollutant, how carry out the mensuration of contents of heavy metal elements in the water body, its routine analyzer complexity, consuming time with atomic absorption method, atomic absorption luminosity method etc.; Sample collecting, storage, transportation and mensuration all have strict requirement, go wrong on any one link and can both cause departing from of measurement result, and easily form the secondary pollution of sample, bring the information of falseness for the environment water quality monitoring management of necessity.Aspect the monitoring of organometallics (as organic mercury, organic cadmium etc.), still there is not effective monitoring means at present, therefore, it is imperative to develop quick, real-time monitoring technology and system.
Summary of the invention
At the developing direction of China's water pollution present situation, water pollution monitoring technology in the world and country urgent demand, the present invention proposes and be used for the environment water heavy metal and toxic metals pollutant multi-parameter comprehensive index is real-time, online, the automatic monitoring of original position and the method and system of portable field emergency monitoring the water pollution monitoring.This method need not sampled, and directly pollutes on-the-spot real-time in-situ and measures, can realize minor metallic element in the natural water in real time, original position and on-line monitoring, and the multielement quantitative measurment of toxic heavy metal element in the industrial waste water under the severe environmental conditions.
Technical scheme of the present invention is as follows:
Water body metal pollutant laser breakdown optical spectrum detecting method, it is characterized in that the short-pulse laser that is sent by laser instrument focuses on and act on the water sample surface, produce high-temperature plasma, before the plasma cooling, the atom that is excited, ion and molecule will produce the plasma emission spectral line of elemental composition feature, after the process leaded light device is transferred to the spectrometer beam split, carry out the conversion of photosignal by ccd detector, enter data acquisition then, disposal system is carried out data acquisition process, element-specific line strength is analyzed to carry out the quantitative measurment of constituent content.
Said method, it is characterized in that the described short-pulse laser that sends by laser instrument through the laser coupled Lens Coupling to launching fiber, again by launching fiber to the laser coupled lens combination, focus on and act on the water sample surface at last; Described leaded light device is made up of aforesaid laser coupled lens combination/another laser coupled lens combination and reception optical fiber, the atom that is excited, ion and molecule will produce the plasma emission spectral line of elemental composition feature, by aforesaid laser coupled lens combination/another laser coupled lens combination, reception optical fiber, be transferred to spectrometer; Described laser coupled lens are made up of the convex lens that comes one and concave mirror, a concave mirror, and the laser coupled lens combination is made up of laser coupled lens and a convex lens.
Water body metal pollutant laser breakdown spectrum investigating system includes laser instrument, it is characterized in that laser output is equipped with the laser coupled lens, connects by launching fiber between the light inputting end of laser coupled lens output terminal and laser coupled lens combination; The light inputting end of spectrometer is connected with reception optical fiber, and spectrometer divides light output end that ccd detector is installed, and the other end that receives optical fiber inserts the light inputting end of aforementioned laser coupled lens/another laser coupled lens; The signal output part of ccd detector inserts data acquisition, disposal system, and power supply and computer control system provide the power supply of laser instrument and detector and set up data communication with detector and data acquisition, disposal system; Described laser coupled lens are made up of the convex lens that comes one and concave mirror, a concave mirror, and the laser coupled lens combination is made up of laser coupled lens and a convex lens.
The present invention adopts optical fiber to carry out the transmission of Laser emission and the reception of plasma signal, avoided external environment to the influence of signal and reduced system bulk greatly effectively, make the system architecture compactness, be easy to carry, be suitable for to minor metallic element in the natural water in real time, original position and on-line monitoring, and the multielement quantitative measurment of toxic heavy metal element in the industrial waste water under the severe environmental conditions.The on-the-spot emergency monitoring that can be used for pollution source discharging on-line monitoring and contamination accident.
The atomic emission spectrum that detects with heavy metal and toxic metals pollutant in the traditional water body, spectrophotometric method, titrimetry etc. are compared, and characteristics of the present invention are summarized as follows:
(1) analysis is easy, quick, need not loaded down with trivial details sample pretreatment, has avoided the secondary pollution of sample;
(2) sample size is not had strict demand, and the sample consumption is extremely low, and carries out multielement simultaneously and measure;
(3) carry out remote monitoring by light transmitting fiber, and mal-condition monitoring automatically down.
(4) can be used for fixed point, the on-line monitoring of pollutant discharge of enterprise mouth, the real-time monitoring of heavy metal and toxic metals pollutant load in people's domestic water, and the on-the-spot emergency monitoring of contamination accident.
Description of drawings
Fig. 1 is one of system architecture of the present invention synoptic diagram.
Fig. 2 is two synoptic diagram of system architecture of the present invention.
Fig. 3 is a laser coupled lens group structure synoptic diagram of the present invention.
Embodiment
As shown in Figure 1, water body metal pollutant laser breakdown spectrum investigating system, laser output is equipped with the laser coupled lens, connects by launching fiber between the light inputting end of laser coupled lens output terminal and laser coupled lens combination; The light inputting end of spectrometer is connected with reception optical fiber, and spectrometer divides light output end that ccd detector is installed, and the other end that receives optical fiber inserts the light inputting end of another laser coupled lens; The signal output part of ccd detector inserts data acquisition, disposal system, and power supply and computer control system provide the power supply of laser instrument and detector and set up data communication with detector and data acquisition, disposal system.
As shown in Figure 2, water body metal pollutant laser breakdown spectrum investigating system, laser output is equipped with the laser coupled lens, connects by launching fiber between the light inputting end of laser coupled lens output terminal and laser coupled lens combination; The light inputting end of spectrometer is connected with reception optical fiber, and spectrometer divides light output end that ccd detector is installed, and the other end that receives optical fiber inserts aforementioned laser coupled lens light inputting end, receives optical fiber and incident optical and adopts " Y " shape optical fiber fabrication; The signal output part of ccd detector inserts data acquisition, disposal system, and power supply and computer control system provide the power supply of laser instrument and detector and set up data communication with detector and data acquisition, disposal system.
As shown in Figure 3, the laser coupled lens are made up of the convex lens that comes one and concave mirror, a concave mirror.
The laser coupled lens combination is made up of laser coupled lens and a convex lens.
Table 1 water body metal pollutant laser breakdown spectrum investigating system performance index
| Transmitter unit | Probe unit | ||
| Light-pulse generator | Computing machine | Detector | CCD |
| Wavelength | 1064nm | Computing machine | IBM PC |
| Repetition frequency | 20Hz | Measurement index | |
| Pulse energy | 200mJ | Measure element | Detection limit (ppm) |
| Pulse width | 4.5ns | Cd | 2.0 |
| The angle of divergence | ＜0.6mrad | Cu | 0.1 |
| Receiving element | Hg | 15.0 | |
| Optical fiber | A branch of four bundles that are divided into | Xn | 2.0 |
| The input diameter | 25mm | Pb | 15.0 |
| The output diameter | 10mm | Cr | 0.5 |
| Spectrometer | The OMA system |
Act on the water sample surface after the present invention utilizes short-pulse laser to focus on and produce high-temperature plasma, before the plasma cooling, the atom that is excited, ion and molecule will produce the plasma emission spectral line of elemental composition feature, analyze to carry out the quantitative measurment of constituent content by the plasma spectrometry of reception water sample and to element-specific line strength.The laser that laser instrument sends through the laser coupled Lens Coupling to launching fiber, carry out the reception of Laser emission and laser plasma signal by the laser coupled lens combination, the plasma signal that receives carries out beam split through receiving Optical Fiber Transmission to spectrometer, carry out the conversion of photosignal by ccd detector, enter data Collection ﹠ Processing System then and carry out data acquisition process, power supply and computer control system provide the power supply of laser instrument and detector and logical sequence and the trigger pip of surveying control.
Claims (3)
1, water body metal pollutant laser breakdown optical spectrum detecting method, it is characterized in that the short-pulse laser that is sent by laser instrument focuses on and act on the water sample surface, produce high-temperature plasma, before the plasma cooling, the atom that is excited, ion and molecule will produce the plasma emission spectral line of elemental composition feature, after the process leaded light device is transferred to the spectrometer beam split, carry out the conversion of photosignal by ccd detector, enter data acquisition then, disposal system is carried out data acquisition process, and element-specific line strength is analyzed to carry out the quantitative measurment of constituent content.
2, method according to claim 1, it is characterized in that the described short-pulse laser that sends by laser instrument through the laser coupled Lens Coupling to launching fiber, again by launching fiber to the laser coupled lens combination, focus on and act on the water sample surface at last; Described leaded light device is made up of aforesaid laser coupled lens combination/another laser coupled lens combination and reception optical fiber, the atom that is excited, ion and molecule will produce the plasma emission spectral line of elemental composition feature, by aforesaid laser coupled lens combination/another laser coupled lens combination, reception optical fiber, be transferred to spectrometer; Described laser coupled lens are made up of the convex lens that comes one and concave mirror, a concave mirror, and the laser coupled lens combination is made up of laser coupled lens and a convex lens.
3, water body metal pollutant laser breakdown spectrum investigating system includes laser instrument, it is characterized in that laser output is equipped with the laser coupled lens, connects by launching fiber between the light inputting end of laser coupled lens output terminal and laser coupled lens combination; The light inputting end of spectrometer is connected with reception optical fiber, and spectrometer divides light output end that ccd detector is installed, and the other end that receives optical fiber inserts the light inputting end of aforementioned laser coupled lens/another laser coupled lens; The signal output part of ccd detector inserts data acquisition, disposal system, and power supply and computer control system provide the power supply of laser instrument and detector and set up data communication with detector and data acquisition, disposal system; Described laser coupled lens are made up of the convex lens that comes one and concave mirror, a concave mirror, and the laser coupled lens combination is made up of laser coupled lens and a convex lens.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB200610098153XA CN100510714C (en) | 2006-12-05 | 2006-12-05 | Laser breakdown spectrographic detection method and system for metal pollutants in water body |
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|---|---|---|---|
| CNB200610098153XA CN100510714C (en) | 2006-12-05 | 2006-12-05 | Laser breakdown spectrographic detection method and system for metal pollutants in water body |
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| CN1995979A true CN1995979A (en) | 2007-07-11 |
| CN100510714C CN100510714C (en) | 2009-07-08 |
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| CN101477723B (en) * | 2008-08-16 | 2012-12-12 | 深圳市紫光平安技术有限公司 | Optical spectrum signal detection method, system and device |
| CN102901717A (en) * | 2012-06-12 | 2013-01-30 | 中国科学院安徽光学精密机械研究所 | Laser-induced breakdown spectroscopy-based portable handheld soil heavy mental detection device |
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| US9228893B2 (en) | 2009-12-01 | 2016-01-05 | University Of Leicester | Apparatus for measuring pollutants and method of operating the same |
| WO2011067599A1 (en) | 2009-12-01 | 2011-06-09 | University Of Leicester | Apparatus for measuring pollutants and method of operating the same |
| CN103185700B (en) * | 2011-12-29 | 2016-08-31 | 中央大学 | Variable optical path measuring device and method for measuring components and concentration thereof in water |
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| CN105300888B (en) * | 2015-10-27 | 2018-08-28 | 吉永强 | A kind of on-line measurement device and its measurement method |
| CN105510243A (en) * | 2015-12-31 | 2016-04-20 | 聚光科技(杭州)股份有限公司 | Spectral analysis device |
| CN105784682A (en) * | 2016-05-10 | 2016-07-20 | 中国科学院光电研究院 | Detection device and detection method by laser induced breakdown spectroscopy |
| CN105784682B (en) * | 2016-05-10 | 2019-02-15 | 中国科学院光电研究院 | A kind of laser induced breakdown spectroscopy detection device and detection method |
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